mm: Fix typo in unevictable-lru.txt (3cd0b625) · Commits · jan.koester / Linux

Documentation/vm/unevictable-lru.txt

+3 −3

Original line number	Original line	Diff line number	Diff line
	@@ -538,7 +538,7 @@ different reverse map mechanisms.
	process because mlocked pages are migratable. However, for reclaim, if		process because mlocked pages are migratable. However, for reclaim, if
	the page is mapped into a VM_LOCKED VMA, the scan stops.		the page is mapped into a VM_LOCKED VMA, the scan stops.

	try_to_unmap_anon() attempts to acquire in read mode the mmap semphore of		try_to_unmap_anon() attempts to acquire in read mode the mmap semaphore of
	the mm_struct to which the VMA belongs. If this is successful, it will		the mm_struct to which the VMA belongs. If this is successful, it will
	mlock the page via mlock_vma_page() - we wouldn't have gotten to		mlock the page via mlock_vma_page() - we wouldn't have gotten to
	try_to_unmap_anon() if the page were already mlocked - and will return		try_to_unmap_anon() if the page were already mlocked - and will return
	@@ -623,7 +623,7 @@ mapped file pages with an additional argument specifing unlock versus unmap
	processing. Again, these functions walk the respective reverse maps looking		processing. Again, these functions walk the respective reverse maps looking
	for VM_LOCKED VMAs. When such a VMA is found for anonymous pages and file		for VM_LOCKED VMAs. When such a VMA is found for anonymous pages and file
	pages mapped in linear VMAs, as in the try_to_unmap() case, the functions		pages mapped in linear VMAs, as in the try_to_unmap() case, the functions
	attempt to acquire the associated mmap semphore, mlock the page via		attempt to acquire the associated mmap semaphore, mlock the page via
	mlock_vma_page() and return SWAP_MLOCK. This effectively undoes the		mlock_vma_page() and return SWAP_MLOCK. This effectively undoes the
	pre-clearing of the page's PG_mlocked done by munlock_vma_page.		pre-clearing of the page's PG_mlocked done by munlock_vma_page.

	@@ -641,7 +641,7 @@ with it - the usual fallback position.
	Note that try_to_munlock()'s reverse map walk must visit every VMA in a page's		Note that try_to_munlock()'s reverse map walk must visit every VMA in a page's
	reverse map to determine that a page is NOT mapped into any VM_LOCKED VMA.		reverse map to determine that a page is NOT mapped into any VM_LOCKED VMA.
	However, the scan can terminate when it encounters a VM_LOCKED VMA and can		However, the scan can terminate when it encounters a VM_LOCKED VMA and can
	successfully acquire the VMA's mmap semphore for read and mlock the page.		successfully acquire the VMA's mmap semaphore for read and mlock the page.
	Although try_to_munlock() might be called a great many times when munlocking a		Although try_to_munlock() might be called a great many times when munlocking a
	large region or tearing down a large address space that has been mlocked via		large region or tearing down a large address space that has been mlocked via
	mlockall(), overall this is a fairly rare event.		mlockall(), overall this is a fairly rare event.